Added feature randomlyNull. added tests for randomlyNull. Add javadocs for randomlyNull.

src/main/java/com/github/javafaker/Options.java

@@ -1,10 +1,12 @@
 package com.github.javafaker;
 
+import java.util.ArrayList;
 import java.util.List;
 
 public class Options {
     private final Faker faker;
 
+
     protected Options(Faker faker) {
         this.faker = faker;
     }
@@ -31,6 +33,23 @@ public class Options {
         return enumConstants[faker.random().nextInt(enumConstants.length)];
     }
 
+
+    /**
+     * returns the same as option with null as an added possibility
+     * @param value The varargs to take a random element from.
+     * @param <E>   The type of the elements in the varargs.
+     * @return A randomly selected element from the varargs.
+     */
+    public <E> E randomlyNull(E... value) {
+        List<E> elements;
+        elements = new ArrayList<>(value.length);
+        for (int i = 0; i < value.length; i++) {
+            elements.add(i, value[i]);
+        }
+        elements.add(value.length, null);
+        return faker.options().option((E[]) elements.toArray());
+    }
+
     /**
      * Returns a random element from an array.
      *

src/test/java/com/github/javafaker/OptionsTest.java

@@ -35,6 +35,25 @@ public class OptionsTest extends AbstractFakerTest {
         assertThat(faker.options().option(1, 3, 4, 5), isOneOf(integerOptions));
     }
 
+    @Test
+    public void testRandomlyNull() {
+        Integer[] int_list = new Integer[] {1,3,4,5,21,13,45};
+        Integer[] int_list_check = new Integer[] {1,3,4,5,21,13,45,null};
+        String[] string_list = new String[] {"hello", "Goodbye", "Hi", "near", "far"};
+        String[] string_list_check = new String[] {"hello", "Goodbye", "Hi", "near", "far", null};
+        for (int i = 0; i < int_list.length; i++) {
+            Integer temp = faker.options().randomlyNull(int_list);
+            assertThat( temp, isOneOf(int_list_check));
+        }
+
+        for (int i = 0; i < string_list.length; i++) {
+            String temp = faker.options().randomlyNull(string_list);
+            assertThat( temp, isOneOf(string_list_check));
+        }
+
+
+    }
+
     @Test
     public void testOptionWithEnum() {
         assertThat(faker.options().option(Day.class), isOneOf(Day.values()));